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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8dcce484626a023726d1b0b870587b0c1de66af355c47654b99dcb82bb869bf' 
  AND token = '0uH7gEf6i2b3KF693ymfUoMncIO7UR4gNvRJZf85vxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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