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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e6f0b2e965bb9c33446b4a0c314b3d9fda5b6ed5d165ee67e35fd33b443c63' 
  AND token = 'YvsDjn2McPOpuaLyp03Fdx3cy7adPVxmPO5WfNtDRUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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