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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20422d0e50930b4d9846b15d1e869a7c1a5e109cf2e0684c9c351905f0cd16f' 
  AND token = '7DNsTxo8HXfWBNFNokfPE2O6RixZ0B8AdYJoBsAifLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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