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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c4f5e27c1d2dcd2ac5bda7b419024268ced1c65d82910fc04b2aef1c5182f8' 
  AND token = 'PEJLhEyPB/Wcl3WdHPGLP6RfVqrHg4MzQeGisszkEw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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