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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a5cbb3bd343121a26a56f0f121a432bde44c28f3dc1ebfd0e9f9f1e68099ce' 
  AND token = 'K3Sa5rv69MXgYBE1t+hoEodelMj3oiDGcMcTAB+CKHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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