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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cb1d19df6b07848efa31a1c3291d20931858f2c1d64586f73454f43401b304' 
  AND token = '/7xtkU5/sxOdzA+cyuZ5M+wEFdNj1qTy9fA4UvGytVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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