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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47d3ec46bb6b8792e575d71d45e376d5f7055ed69a83a399c8fe7ed7636e18e' 
  AND token = '8zR/YUpXFo2w63lxA9OwYDtxmYZazaVKChYV0L78JZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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