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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a607219f704f1cd6d3a8c1bd0e734bc4ad1537c6ca3d1f89261fe896031a696' 
  AND token = 'E4IJFIYGu2f5ha9DIl9Ql04Vs0VYCRL0Qgzr5Yw7wB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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