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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37da3a2bc7388397e1e077f10d5f4967ef0b228fa93bcfb6be76b907776275d9' 
  AND token = 'MNJZccBIVku8HWE8eehjRGnZ2D7zIRG7ko0pk12GL6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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