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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e2b5246d4b4a3dd80ed06cf5581008017a07411592b496feabd8959c743ce2' 
  AND token = 'B6fq1AhtKO1MIsMcOSO/8TtjUxMoSXKzgJacSaBizRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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