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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1055132da730995870d2b6decd47870baca7f4d90be0475725d5c1079018929c' 
  AND token = 'WUJr0lIU2k6E2+k6mfBzY9gnNu96c6cj52/3NLjxNR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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