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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31728615b97de85ee7e84346f2748c87596b8e7879f2663d405c04b32fba7a2b' 
  AND token = 'f3Zsq06djWmuWsAXP9nwyAxnLklTe9UbeuUEEHIakAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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