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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e76a1b6c167b8337368ca340a026c3d14b8caefb33d5d86d62b8f332bfaf73' 
  AND token = 'b7MN0HJCiJm+fOCohKVRgYMfg4illshif5aJFWAptjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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