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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297a3b871192aadeefb2a89db08d153ed733f9970aa097051548663315f28b68' 
  AND token = 'tVdNouBgfC1OQflCXen5iqmbDNDnvwsqU5vJ/aTKyis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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