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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9790b2c744642ae23f0afeecfa2b73a8e6eef03b7ba89f47702591cf427895' 
  AND token = 'qkk2pPquKpLX2ewQVAukcxWLyYY32L5gF6vcKWkiYAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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