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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d4fdf31ee35bfc57a28c2bea547ba76e823ebf7e44319ed0c6c651ad47e8a2' 
  AND token = 'Bsxy7j5Gh+hVgPSXQVLcp6LNxNu11OutiUherb/2abk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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