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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18dde764b62c66cab6e8d25197f5316a2a9edb26e65f386e3e9cb6d65970527' 
  AND token = 'e8ELWL/DgMTme6Z99GhAcPFij8NqDJ5HxC/etGQpbTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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