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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c842eed1d9a95902cec8f73356acc0031bf06594125f180e09473427fa79e731' 
  AND token = 'eqGeIKs3lnWNjVXbcKLo8Z99G4fN5JxrKVt16wgbjQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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