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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a37f833c38bb2ac1fab4fad2af8fa6f95f4562d40d3fdfe6efc755b91441a99' 
  AND token = 'j7O76u7KzMtirdire+iEQ1hoRVmAgoyTxhJ5x/Dqw9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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