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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf46d7ea114c33c7536a037fbf9de8fc2c0c9a44b242e4c1887f48659ba5866' 
  AND token = 'FNLdeT2ps6fdM1J0QfcsdvJrLPWme7oCJsfHa0d3Uq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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