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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dda14f4ac8481cd0b34fa7644ed21caf207b88be244d05c4ef51ea59bded1bf' 
  AND token = 'H7ixemrpYgeWN6UZBv+EX0c5/eoryHkyHO6XfIR31uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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