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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f48991ba8a1ec523a9a09dd4ad3707577e3e487a96744dfcadefc8efe3937e' 
  AND token = 'uCl27VfrPF18Fia0NVQo5pSK1Vgluc1uJ/Dpzn9cP0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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