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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc40801dc0be8d5e455806a33b3332d1d7c09ceaf793f0353edf4c18b78d7fd2' 
  AND token = '4yiTQaftd8yfCHaJzW9TdYmpmaVqJ8d9xn+bzE6oHjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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