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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec12f89667cfc8af0439e10d16546f8f2f2110007a64171693ebdd74957b954' 
  AND token = '9olV4U7c6cs1pyvXeqBHb3fE85800HIO80fE9V1jlz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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