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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d40a88e9890c70193e9374a94e09007f69c92550f1edb75fd80d43fce30806' 
  AND token = 'LfKJ9+OiDZf3akIL3Jrd2VFAbh9Z2nKXdz1qQkgagU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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