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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1571d62e35b05cf729f504593a4f27f7a2cf188773bc590c1fe39ea480937b' 
  AND token = 'LDpr0m8vh1jyHQNfu030BP8vdSzuyK6AtOrcA3devoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}