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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9e3432b0361c74bcec811c1bcc33a934050b3ac2bf2e7814923d31162c042b' 
  AND token = 'yNo+p18CGjAAElq1LgSaYpkKZYipGxLhN5AM/KGMy50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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