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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306b7e84ef72206dcdef0894fffee1549fc1cdcd5062832e3c7887e94446a1c8' 
  AND token = 'kTCD4uc4u1eX2GqRHcN5lJ7Voq61DBrgNVzpwv/diaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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