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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63614f46f6f14d2b530434372811d19566936e96d1528460efb79e29066c4494' 
  AND token = 'IcJvGxI40eWU0Mx8VgyzoR162uy1PqeBwDrDzNXZsQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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