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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95259c6e996c2d3acd983bcc75b51824184c8e76dfc90526edf538b0a1f0a284' 
  AND token = 'HwWRQjwNEqQsQ/5L0+tPuaJIqVfmvo8Wslaa57SCqtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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