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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d0bfad2faf3d7364df534a75bd5207a16467e8ad524549bea427fec11ae3fa' 
  AND token = 'ka8Oasfq6nWRkR+l94+ORA4kuoIQ8EyRZYRu7dvVnTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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