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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '654a714d589ede2c3e17fd9517973ccd32354199bdd578ef823852ce5e0d545c' 
  AND token = 'gewxn0Ny1d7QiL+hEJRtQJC+3Wn5dHl90N65zUzorqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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