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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0665ec003719e7e7d3b70a3c3d6c32d86538a19b27b35181155426b38a8319' 
  AND token = 'PExYwyMWjKTqZXhPEi7RXgfj3J3koM64+EBtrKfl6r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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