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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c62e2cd440e45b64bbad057e3eb928f6d4eb8711450f8b961153d2f514d265' 
  AND token = 'UCtKyqALAtsyjZqjvG76h85icETr8+y+2NGFNOUciWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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