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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30e30f8e5427b8f79a3aa18205c732a29e6f5a0723da54685bd9ebcf53b2ac1' 
  AND token = 'c+VBbJLMwBSKWSyR6vUqgi7Kx1XVMPNNPs0L3D4grEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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