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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f4a81d42214a84ae22a7a0d0a7606c1d622262f6abba3c4c096fbb24db689a' 
  AND token = 'woEQX/rrb1M4VZUDn4nk+D7Ia/drTGFxegCCgYMb7/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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