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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d247b6e3c6db0277e6cfddb5b673f0aef89ef366b7dce889508a218fc78b263' 
  AND token = '+si7MeRJ6eGlLFEAoDfVmlQ1O+RB3teR+nbCZfuuKuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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