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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'facc88ef86fc89cc64726ce6a2bedef12448a521d90a788116a271c6e7615d2a' 
  AND token = 'bxrWxJkD0afAHwN0V2I2BlhcaRMjY2QOPuAKq87K3aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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