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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e31e3be760055e4978e13c3a2f9ff9502bf97046eb101b094effa8722ed27c' 
  AND token = 'JXMuRV1G7Wx8Om5s3r2kWgQIafCvSwLgoyCbgsdWFnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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