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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e238a4c7b97282ad3b71675fc6ef0b66739ac875a1f0ff77377c06d7bcb5d3d' 
  AND token = 'zZWVmG30IYfXILVACje0SUrJW76eiN5SsdMAUS6usH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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