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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13de951fa1702e44434bdfdfcb3ccbd48e337b32885e4429e509f459710e3169' 
  AND token = '7swAUG/k42bKXC+T0VzFm1KQc07PVQGa9xkkxk6D0So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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