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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bdf2f1766208777b683e5997f6062a9c1f9fa1ab5cabc4ede29696db7bf694' 
  AND token = '/EoBMF9qFQMdMeJ2LtCL+VutC+T/PHN5r6fcBe2WRK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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