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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2dbad483c5aafc079f9320060e43aee0b261377f77139a9204c9c13fae8cfbc' 
  AND token = 'y0gURDOEyxP/H6PZmSWxt3CiMYT42iGQvL7VcLaVDKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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