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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf0a9a994bc0ed0eb842b5f73145fc005ca12127f15498db0f5e185772cb902' 
  AND token = 'OLYDz7ADbg1neQKUtYghhGAbgaL3x+WL1KP5iDPkGps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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