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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f2c2d73f686db1e6b5f6a1f66fa40fb9505a41ad322a95c704bae339180a07' 
  AND token = 'X2PzElATAucXukMeaJWwBjnsbT+hVGLyaB6EbtjKFDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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