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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945d5221e7edb518561b0c3d4f600c0e09a55e5f23529b70acd9f9d1b626ae73' 
  AND token = '7sbixYNNf/TWF0SxyoVMCPElL8+U0zjaZGbSaPzrL5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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