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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0058b0a0fc23e4d2dd0f78e546bdd265d76105c4f7e73d9f04881c0c017fc8a1' 
  AND token = '3Bkw0LdAQa2n/B5OO/UbriH4iyPjzt1vuIk7sij8X6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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