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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf884f708ed23e4c1450d430fff2caea2c4817ff421fe8ddd5c79c32c8a0bb8' 
  AND token = 'm6MEK3sg8AQ4QkTTrqbqheLrQeewbpKl2inGyjzPjkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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