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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4d2a4f00194f3f04f30e2891a593cd72ed2b682be19e6b98057c4d4d306398' 
  AND token = 'Rw9hY1oCP0Xno1Eq9q3JGLWVNHcll2RIGLHqxuSSKwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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